Do you know what factors can cause stainless steel heat exchange tubes to rust? First of all, let’s understand why stainless steel heat exchange tubes rust.
There is a thin but strong and stable chromium-rich oxide film on the surface of the stainless steel heat exchange tube. The oxide film is also a protective film, which mainly plays a protective role and is used to prevent oxygen atoms from continuing to penetrate and oxidize, thereby obtaining corrosion resistance. If this protective film is damaged and continuously infiltrated by oxygen atoms in the air or liquid, or the iron atoms in the metal are continuously precipitated to become loose iron oxide, the surface of the pipe will be continuously corroded.
Let’s talk about some of the more common factors that affect the rust of stainless steel heat exchange tubes in daily life.
1) Dust containing other metal elements or foreign metal particles is deposited on the stainless steel surface. In humid air, the condensed water between the accessories and the stainless steel will connect the two into a miniature battery, resulting in an electrochemical reaction and Destruction of the protective film is called electrochemical corrosion.
2) The surface of stainless steel heat exchange tubes has organic juices, such as melons, noodle soup, phlegm, etc., which form organic acids under the combined action of water and oxygen, and then corrode the surface of stainless steel heat exchange tubes for a long time.
3) The surface of the stainless steel heat exchange tube is stuck with acid, alkali and salt, which leads to local corrosion of the machine.
4) In the polluted air containing a large amount of sulfide, carbon oxide and oxidative inflammation, the condensed water will form sulfuric acid, nitric acid and acetic acid spots, causing chemical corrosion.
These factors will cause stainless steel heat exchange tubes to rust!